Fuse size for Battery Isolator?

Henderman

New member
I’m looking at putting an Isolator in my van to allow my house batteries to charge while I drive (I also have solar panels). The isolator I’m looking at is 140 Amps max. What size fuse should I use between the isolator and the house batteries? My house battery is a Weize 12V 100Ah LiFePO4 Lithium Battery.
 

Verkstad

Raggarkung
Ultimately fuses (or your favourite OCPD) is there to protect conductors.
Its proper capacity depends on the conductor size used. (So you should share with us the conductor size you plan to use...)
Said that, you can also select fuses to help protect appliances or devices in the current path or to limit expected loads.
But never select a fuse size whats larger than the amperage the conductors can safely carry.
 
Also need a length of run for the wires.
for 4 gauge it would be a max of 200 amp at 15 to 25 feet. Under that length 4g is overkill 8 gauge would do 200amp at 5 to 7 feet
150 amp at 7 to 10 feet.
How many amps are being drawn by the accessories? If not amps what's the wattage?
 

Regcabguy

Expedition Leader
Also need a length of run for the wires.
for 4 gauge it would be a max of 200 amp at 15 to 25 feet. Under that length 4g is overkill 8 gauge would do 200amp at 5 to 7 feet
150 amp at 7 to 10 feet.
How many amps are being drawn by the accessories? If not amps what's the wattage?
I love your forum name. 😄
 

Henderman

New member
The wire from the alternator to the battery would run about 14' (all the way from the engine to the battery at the back of the van)
Total amps would be about 60 at max usage.
 
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